NDLI: Measuring privacy in high dimensional microdata collections

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Measuring privacy in high dimensional microdata collections

Content Provider	ACM Digital Library
Author	Katzenbeisser, Stefan Boukoros, Spyros
Abstract	Microdata is collected by companies in order to enhance their quality of service as well as the accuracy of their recommendation systems. These data often become publicly available after they have been sanitized. Recent reidentification attacks on publicly available, sanitized datasets illustrate the privacy risks involved in microdata collections. Currently, users have to trust the provider that their data will be safe in case data is published or if a privacy breach occurs. In this work, we empower users by developing a novel, user-centric tool for privacy measurement and a new lightweight privacy metric. The goal of our tool is to estimate users' privacy level prior to sharing their data with a provider. Hence, users can consciously decide whether to contribute their data. Our tool estimates an individuals' privacy level based on published popularity statistics regarding the items in the provider's database, and the users' microdata. In this work, we describe the architecture of our tool as well as a novel privacy metric, which is necessary for our setting where we do not have access to the provider's database. Our tool is user friendly, relying on smart visual results that raise privacy awareness. We evaluate our tool using three real world datasets, collected from major providers. We demonstrate strong correlations between the average anonymity set per user and the privacy score obtained by our metric. Our results illustrate that our tool which uses minimal information from the provider, estimates users' privacy levels comparably well, as if it had access to the actual database.
Starting Page	1
Ending Page	8
Page Count	8
File Format	PDF
ISBN	9781450352574
DOI	10.1145/3098954.3098977
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2017-08-29
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Privacy Privacy metrics Microdata User empowerment
Content Type	Text
Resource Type	Article

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